Mini/leanto greenhouse help please!

[drspouse]

I am thinking of getting this leanto greenhouse - I currently have a really small and rickety wooden and plastic job. This isn't that much bigger.
Do I need a base? Shelves? It's going on paving.

I would definitely put down a base, a couple of large paving slabs should do it will stabilise the structure and be extra protection against weeds that might grow in the cracks of your existing paving.

Adjustable shelves would be an asset as you could get more seed trays in and remove them if you wanted to grow tomatoes.

It will be going on existing paving, do I need more slabs on top? Also do I need the plinth??